ASME Section III Design-By-Analysis Criteria Concepts and Stress Limits

[+] Author and Article Information
Gerry C. Slagis

 G C Slagis Associates, 258 Hillcrest Place, Pleasant Hill CA 94523-2184slagisg@asme.org

Italics indicate wording taken from the Section III code document (if no reference given) or the referenced document.

The 1.5 factor is for a rectangular beam. NB-3221.3 refers to αSm based on the shape factor for the section. NB-3600 for piping uses 1.5 for all tubular piping products.

The quoted Ref. 6 is Ref. 9 in this document.

J. Pressure Vessel Technol 128(1), 25-32 (Oct 24, 2005) (8 pages) doi:10.1115/1.2140797 History: Received August 26, 2005; Revised October 24, 2005

The ASME Section III design-by-analysis approach provides stress criteria for the design of nuclear components. Stresses are calculated elastically for the most part, although plastic analysis is recognized. Limits are specified for primary, secondary, and peak stresses. Inherent in these limits are factors of safety against several modes of failure. The purpose of this paper is to explain the design-by-analysis criteria and fundamental concepts behind the approach. Topics covered include the bases for the primary stress limits, shakedown to elastic action, fatigue, simplified elastic-plastic analysis, and thermal stress ratchet. Issues that are explored are separating primary and secondary stresses in finite element analyses, material ductility requirements, and the meaning of the fatigue penalty factor.

Copyright © 2006 by American Society of Mechanical Engineers
Topics: Stress , Design , Pressure
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Figure 1

NB-3200 design-by-analysis stress limits (2001)

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Figure 2

Rectangular cross-section bar in tension

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Figure 3

Rectangular cross-section bar in bending

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Figure 4

Shakedown to elastic action

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Figure 6

Discontinuity analysis

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Figure 7

Moment in flat plate with and without discontinuity moment



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